Seeing this, Qiu Zhenghao had no choice but to hurriedly follow and swim effortlessly behind.

Fortunately, the direction of progress is the same as the direction of the undercurrent, and it will not be too strenuous.

Just now, when Liu Haoyu was searching with his divine sense, he finally found a clue in one of the tributaries, and his divine consciousness first encountered an obstacle there, although it was unobstructed in an instant, but for him, this situation was still very strange.

What was it that was holding back his senses?

Liu Haoyu felt that there would be no other possibilities other than the place Qiu Zhenghao said.

In this current earth, if it weren't for the means of cultivators, there would be almost no place to stop the exploration of divine consciousness.

It's a bit far, about a dozen or so kilometers.

Liu Haoyu only needs to urge the true yuan force to swim as easily as a fish in the water.

But Qiu Zhenghao is different, he is really tired, his limbs are gradually weak, and what's worse is that the oxygen cylinder is running out of oxygen.

Looking at Liu Haoyu, who seemed to be dragging something under his feet, Qiu Zhenghao was also extremely shocked.

Is this still human?

Even if you are a strong grandmaster, it is impossible to behave like this in the water!

He had the illusion that Liu Haoyu was a person who was transformed from a fish essence......

Otherwise, how could he be so comfortable in the water? and it doesn't seem to suffocate.

At this time, Qiu Zhenghao glanced at the remaining content in the oxygen cylinder, and panicked for a moment.

Why is oxygen running out so quickly?

At this moment, he himself was a little puzzled, he was accidentally sucked into the undercurrent many years ago, and there was no oxygen cylinder to assist him at that time, but he was able to reach that mysterious cave unharmed, and did not suffocate in the water......

"Senior, senior, help! I'm running out of oxygen. Regardless of whether Liu Haoyu could hear it or not, Qiu Zhenghao screamed loudly in the back.

He was really panicked.

In this sealed underground river, if there is no oxygen, he will be certain death.

He didn't seem to be able to breathe freely in the water, like the previous senior, or he didn't need to breathe......

He didn't know which one it was, and he didn't want to know, he just hoped that Senior Liu could hear his shouts and turn around to save himself.

Liu Haoyu, who was slowing down as much as possible in front, moved his ears at this time and heard the call from Qiu Zhenghao behind.

Both of them were in the water, and they were nearly ten meters apart, and under normal circumstances, ordinary people naturally couldn't hear Qiu Zhenghao's voice shouting through the oxygen mask.

But Liu Haoyu is not an ordinary person, even in the water, he still has amazing hearing.

"Hey, it's a trouble, why don't you have a little self-knowledge? What do you have to do with you......" Liu Haoyu shook his head slightly, sighing in disgust.

He stopped and kept going.

At a distance of only ten meters, Qiu Zhenghao swam over at once.

Seeing Liu Haoyu actually stop and wait for him, Qiu Zhenghao was almost moved to cry.

He understood that his seniors must have heard his cries for help.

I just don't know, what can the predecessors do to save themselves?

Thinking of this, Qiu Zhenghao was very worried in his heart, he was worried that his predecessors would not be able to help him, and after leaving some words of condolence, he let himself wait for death......

Qiu Zhenghao's thoughts at the moment are very rich, and he has thought about the good and bad aspects.

"You're such a nuisance!"

Hearing this sentence that suddenly appeared in his ears, Qiu Zhenghao's heart trembled, and at the same time, he was also slightly relieved.

Listening to this tone, it seems that Senior Liu has no intention of abandoning himself!

At this time, Liu Haoyu stretched out his hand and grabbed Qiu Zhenghao's shoulder.

Immediately afterwards, before Qiu Zhenghao could react, the two of them rushed out towards the front of the undercurrent like bows and arrows off the string.

I'll go, humanoid torpedoes?

Looking at the rapidly regressing scene around him through the headlamp, Qiu Zhenghao was stunned.

He couldn't imagine that this was still human.

At this extreme speed, only a moment later, Liu Haoyu grabbed Qiu Zhenghao upright, and suddenly the two of them rushed out of the water and landed on the relatively dry ground on the shore.

Qiu Zhenghao didn't have time to be surprised, the headlamp on his head flickered, and he glanced at the scene in front of him, and the whole person suddenly couldn't help but be excited: "Yes, yes, this is it!"

Then, Qiu Zhenghao glanced back again, and behind them, there was a small waterhole with a diameter of only a few meters.

And just now, they came through the underground river connected by this pool.

In front of them, there was a cave several meters in diameter that led to nowhere.

As Qiu Zhenghao said before, the walls of this cave are inlaid with gems at intervals, and the bright light emitted illuminates the entire cave.

In short, it can be seen at a glance that this cave has obvious traces of man-made, and it is obviously impossible for ordinary people to dig such a cave under such a deep underground.

"Senior, this cave can go forward for a certain distance, but after walking about fifty meters, you can't get through it in front of you, and there is an invisible barrier. ”

"In addition, I have tried these gems on the wall, but I can't pick them off, as if they are connected to the wall as a whole......"

Qiu Zhenghao didn't hide it at all, nor did he feel embarrassed, he confessed everything he knew.

In fact, what he said is of little value to Liu Haoyu......

After carefully looking at the cave a few times, Liu Haoyu didn't say anything, and walked directly inside.

Seeing this, Qiu Zhenghao hurriedly followed behind.

"Senior, be careful! Probably a few meters in front is where the invisible barrier is, I didn't pay attention to it at the time, it hurts to bump into it!"

Liu Haoyu didn't pay attention to Qiu Zhenghao's warning, in fact, when he was so close, he had already sensed the abnormality in front of him.

When he was only one step away from the invisible barrier in Qiu Zhenghao's mouth, Liu Haoyu stopped in time, stretched out his hand and gently stroked it forward.

Suddenly, the hand was blocked by a hard presence.

But to the naked eye, there is still an empty cavern in front of which you can't see the bottom and you don't know where to go, and there are no obstacles in between.

"Senior, you see what I said is right, right?" Qiu Zhenghao came up at this time, and said flatteringly in front of Liu Haoyu with a look of invitation.

Then, Qiu Zhenghao couldn't help but ask curiously: "Senior, can you break through this invisible barrier?"